/*****************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations
 * under the License.
 ****************************************************************/
package reco.db.validation;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import reco.db.Constraint;
import reco.db.ConstraintFactory;
import reco.db.Field;

import com.google.common.base.Preconditions;

/**
 * 
 */
public abstract class SimpleConstraintFactory implements ConstraintFactory {

    private final Class<?> expectedType;

    /**
     * 
     */
    public SimpleConstraintFactory(Class<?> createdConstraintExpectedType) {
        this.expectedType = Preconditions.checkNotNull(createdConstraintExpectedType, "createdConstraintExpectedType");
    }

    @Override
    public <T> Constraint<T> createConstraintFor(Field<T, ?> field) {
        checkNotNull(field, "field");
        checkArgument(getExpectedType().isAssignableFrom(field.getType()), "field is not of the expected type [%s]", getExpectedType().getName());

        return createConstraint();
    }

    protected abstract <T> Constraint<T> createConstraint();

    protected Class<?> getExpectedType() {
        return this.expectedType;
    }
}
